‘Pictures can speak a thousand words’. Blending this with the essence of shock photography is this brilliant mobile billboard for The Red Cross, currently freaking out residents of San Francisco.

It’s photo journalism, meets Hollywood blockbuster movie poster, and it is turning plenty of heads wherever it parks itself. Enthusiastic onlookers have been snapping up photos of the mobile billboard and posting, uploading and sharing them online with friends. This is a brilliant example of how an audience can further promote the exposure of a great advertising campaign through mobile phones, blogs and sites such as flicker.